Why does your Citrus unshiu have yellow leaves? Diagnose the cause and fix it with our step-by-step guide.
This is common in citrus when soil pH is too high (alkaline), preventing the tree from absorbing iron. You will notice yellowing between the veins while the veins remain dark green.
Satsuma mandarins are sensitive to 'wet feet.' Excessive moisture displaces oxygen in the soil, leading to root rot which prevents nutrient transport, causing uniform leaf yellowing.
Citrus trees are heavy feeders. A lack of nitrogen causes older, lower leaves to turn pale yellow first as the plant mobilizes nutrients to new growth.
Larvae tunneling through the leaves cause physiological stress. While primarily known for silvery trails, severe infestations can lead to leaf discoloration and premature yellowing/drop.
Your plant might also be experiencing one of these issues:
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